Changes in the App Store as of OS 3.0 All apps released from 17 June will only be compatible with iPhone OS 3.0. Apps released prior to that date will also support OS 2, but must ensure compatibility with the new firmware. It makes good business sense for Apple to demand this of devs. With the arbitrary date of 17 June set, iPod touch users who want to download new paid and free apps, must first fork over 10$ – even if the app has no features that take advantage of OS 3.0.